. Elementary plant physiology. Plant physiology. 72 Elementary Plant Physiology. Any loss of weight from this preparation should be due to the transpiration of water from the leaves. Set the plant on one pan of the balance, together with a small measuring-glass, and add weights to the other pan to bring the balance to an equi- librium. Four hours later note the condition of the balance. Fill a burette with water to the level of one of its divisions. Carefully run water from the burette into the measuring-glass on the pan until the balance is brought back to its original position. The amount of
. Elementary plant physiology. Plant physiology. 72 Elementary Plant Physiology. Any loss of weight from this preparation should be due to the transpiration of water from the leaves. Set the plant on one pan of the balance, together with a small measuring-glass, and add weights to the other pan to bring the balance to an equi- librium. Four hours later note the condition of the balance. Fill a burette with water to the level of one of its divisions. Carefully run water from the burette into the measuring-glass on the pan until the balance is brought back to its original position. The amount of water in the glass will represent the transpiration. Note the temperature of the air around the plant during the experi- ment. Take the cloth from the plant, and ^\â ater it in the usual manner. On the follow- a lower or higher tem- Compare Fig. 51.âBalance for estimation of amount of transpiration. After Oels. ing day repeat the test as before, at perature, ^\-ith the plant prepared as before Make other tests in sunlight and shade. 66. Guttation.âProcure a number of seedlings of wheat (Triticiiui), corn {Zea), rice {Oryzd), or young plants of Coleus, growing in soil in a pot, and set on a glass plate. \\'ater freely, and then cover with the bell jar. A few hours later note the exudation of drops of water at various points on the plant. Make a careful sketch of two or three specimens, showing exact location of drops. Remove the bell jar and note results. Make a careful examination of sections through the parts on which drops of water had collected, in a search for water pores and outlets for liquid under pressure. The exudation pressure of the living cells forces water into the vessels and other dead. Please note that these images are extracted from scanned page images that may have been digitally enhanced for readability - coloration and appearance of these illustrations may not perfectly resemble the original MacDougal, Daniel Trembly, 1865-1958. New York
Size: 1820px × 1373px
Photo credit: © The Book Worm / Alamy / Afripics
License: Licensed
Model Released: No
Keywords: ., bookcentury1900, bookdecade1900, booksubjectplantph, bookyear1902
